US4605888A - Starting winding switching circuit for single-phase induction motors - Google Patents

Starting winding switching circuit for single-phase induction motors Download PDF

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Publication number
US4605888A
US4605888A US06/657,361 US65736184A US4605888A US 4605888 A US4605888 A US 4605888A US 65736184 A US65736184 A US 65736184A US 4605888 A US4605888 A US 4605888A
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terminal
triac
scr
npn transistor
motor
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Expired - Fee Related
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US06/657,361
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In S. Kim
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/42—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor
    • H02P1/44—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor by phase-splitting with a capacitor

Definitions

  • the present invention relates to the field of single-phase induction motors, and more particularly to a switching device for electrically connecting and removing the starting winding from the single-phase induction motor's circuitry.
  • Single-phase induction motors typically comprise a distributed stator main winding, an auxiliary winding, and a squirrel-cage rotor.
  • a distributed stator main winding As discussed in the Del Toro's test Electromechanical Devices For Energy Conversion And Control Systems, Prentice-Hall, Inc. 1968, pps. 360-90, an a.c. supply voltage applied only to the stator winding creates a field fixed in space and alternating in magnitude. The field therefore produces no starting torque on the rotor. This condition, however, prevails only at rotor standstill. If, by some means, the rotor is started in either direction, it will develop a nonzero net torque in that direction and thereby cause the motor to achieve synchronous speed.
  • the typical non-mechanical method of starting a single phase induction motor is to temporarily include a second, auxiliary winding around the rotor to produce a revolving field of constant amplitude and constant linear velocity.
  • This revolving field creates the necessary starting torque needed to start the rotor turning on its axis.
  • the two windings are preferably space-displaced by 90 electrical degrees.
  • the current flowing through these windings are preferably time-displaced by 90 electrical degrees and the windings must have such magnitudes that the mmf's are equal.
  • the space-displacement criterion is met by placing the auxiliary winding in the stator with its axis in quadrature with that of the main winding.
  • the main winding occupies two-thirds of the stator slots, with the auxiliary winding occupying the remaining one-third.
  • the time displacement criterion regarding the currents through the two windings is at least partially obtained by designing the auxiliary winding for high resistance and low leakage reactance. This is in contrast to the main winding which typically has lower resistance and higher leakage reactance. Due to the high-resistance characteristic and the short time power rating inherent in the auxiliary winding, they must be removed from the line once a sufficient percentage of synchronous speed is reached.
  • Another prior art method for removing the auxiliary winding from the line involves replacing the centrifugal action switch with a triac-based circuit, wherein the triac is controlled based on the current in the main stator winding.
  • this method is complex and inherently limited to a small range of applications.
  • the invention relates to a switching device for electrically connecting a starting winding in a single-phase induction motor from initial start-up until the motor has achieved a first predetermined speed, at which point the device electrically removes the starting winding from the motor's circuitry. Should the motor's speed drop below a second predetermined speed, the switching device will electrically reconnect the starting winding to the motor's circuitry until the motor again achieves the first predetermined speed.
  • the switching device comprises a triac in series with the motor's starting winding. Connected across the triac is the a.c. side of a diode bridge.
  • the d.c. side of the diode bridge includes a silicon control rectifier (SCR) controlled by a voltage control circuit connected in parallel across the motor's starting winding.
  • SCR silicon control rectifier
  • the voltage control circuit also receives a small voltage drop, and the voltage control circuit is essentially off.
  • the a.c. voltage across the diode bridge produces sufficient voltage on its d.c. side to turn the SCR on, thereby effectively shorting out the d.c. side of the diode bridge. Due to this short, a large current is drawn through the a.c. side of the diode bridge.
  • a resistor in series with the a.c. side of the diode bridge and connected to the gate terminal of the triac, produces a voltage drop large enough to turn the triac on. Since the triac is in series with the starting coil, current flows through the starting coil, producing sufficient torque to start the motor.
  • the voltage drop across the starting coil, and hence the voltage control circuit is large enough to turn the voltage control circuit on, thereby turning the SCR off.
  • the SCR off With the SCR off, the large current drain on the a.c. side of the diode bridge is no longer present.
  • the potential voltage across the resistor, in series with the a.c. side of the diode bridge decreases. This decreased voltage is not sufficient to keep the triac on. Accordingly, the triac turns off and the starting winding is electrically removed from the motor's circuit.
  • the voltage control circuit in the present invention comprises a series of transistors. By taking advantage of their different saturation and cutoff voltage levels, a hysteresis characteristic is available for motor control applications.
  • the switching circuit of the present invention includes a hysteresis characteristic which takes the starting winding out of the motor's circuit once the motor reaches a first predetermined speed, but does not reconnect the starting coil until the motor falls below a second, lower, predetermined speed.
  • FIG. 1 shows the preferred embodiment of the starting coil switching circuit of the present invention.
  • FIG. 2 shows another embodiment of the starting coil switching circuit of the present invention.
  • FIG. 1 the preferred embodiment of the starting coil switching circuit of the present invention is shown.
  • diode bridge D1 When an a.c. voltage is first applied to terminals A1 and A2 of motor M, a voltage is applied to diode bridge D1 through starting capacitor C1, starting coil L2, and resistor R6 on one side, and resistor R8 on the other side.
  • the diode bridge outputs positive rectified voltage to anode A of silicon control rectifier (SCR) S2 and a reference voltage to cathode K of the SCR.
  • SCR silicon control rectifier
  • the positive rectified voltage also sets up a current applied to gate G of the SCR through resistor R1, thereby turning the SCR ON.
  • the induced voltage across the starting winding is directly proportional to the rotational velocity of the motor.
  • the voltage across the starting winding is small.
  • the voltage across capacitor C2 is small. This voltage is not enough to turn ON NPN transistor TR2. Therefore, as no base current is supplied to PNP transistor TR1, it also remains OFF.
  • the voltage drop across the starting winding increases, increasing the voltage drop across capacitor C2.
  • the increased voltage drop across C2 causes the NPN transistor to turn ON, supplying the PNP transistor with adequate base current to saturate the PNP transistor.
  • the SCR's gate current flows through the PNP transistor TR1.
  • the value of resistor R1 is relatively high so that the voltage drop across R1 is not sufficient to keep the SCR turned ON, and it subsequently draws no current.
  • the SCR OFF since the resistance value of resistor R1 is high, a lower current is drawn on the d.c. side of the diode bridge. Thus, a lower current draw is reflected to the a.c.
  • the starting coil is electrically disconnected from the motor's circuitry. Although the starting coil is effectively removed, the starting torque initially produced allows the rotor to reach synchronous speed by the flux created in the main winding.
  • control circuit B connects the starting coil to the motor's circuit until the motor reaches at least 60% synchronous speed, at which point the triac is turned off and the starting coil is electrically removed from the circuit.
  • the triac is turned back on, reconnecting the starting coil, as will now be explained.
  • transistor TR2 If the motor should experience a load such that its speed dips below about 40% synchronous speed, transistor TR2 is cut OFF thereby turning transistor TR1 OFF. Accordingly, the voltage potential at R1 turns the SCR back on, short-circuiting the d.c. side of the diode bridge, causing a large current draw on the a.c. side. This large current through resistor R8 produces a large enough voltage drop to turn the triac back ON, electrically reconnecting the starting coil in the circuit.
  • control circuit B and transistor TR1 have a hysteresis characteristic which disconnect the starting coil from the single phase induction motor once the motor attains at least 60% synchronous speed, and reconnects the starting coil when motor drops below about 40% synchronous speed.
  • FIG. 2 another embodiment of the starting coil switching circuit of the present invention is shown.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor And Converter Starters (AREA)
  • Control Of Ac Motors In General (AREA)
US06/657,361 1983-02-21 1984-02-17 Starting winding switching circuit for single-phase induction motors Expired - Fee Related US4605888A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1983692 1983-02-21
KR1019830000692A KR840002367B1 (ko) 1983-02-21 1983-02-21 단상 유도전동기 기동용 전압식 전자릴레이

Publications (1)

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US4605888A true US4605888A (en) 1986-08-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
US06/657,361 Expired - Fee Related US4605888A (en) 1983-02-21 1984-02-17 Starting winding switching circuit for single-phase induction motors

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US (1) US4605888A (ja)
JP (1) JPS59159681A (ja)
KR (1) KR840002367B1 (ja)

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4751450A (en) * 1986-09-24 1988-06-14 Pt Components, Inc. Low cost, protective start from coast circuit
US4751449A (en) * 1986-09-24 1988-06-14 Pt Components, Inc. Start from coast protective circuit
US4782278A (en) * 1987-07-22 1988-11-01 Pt Components, Inc. Motor starting circuit with low cost comparator hysteresis
US4786850A (en) * 1987-08-13 1988-11-22 Pt Components, Inc. Motor starting circuit with time delay cut-out and restart
US4804901A (en) * 1987-11-13 1989-02-14 Kilo-Watt-Ch-Dog, Inc. Motor starting circuit
EP0356310A1 (en) * 1988-08-16 1990-02-28 In Suk Kim Electronic motor starter
FR2655216A1 (fr) * 1989-11-28 1991-05-31 Brasil Compressores Sa Circuit electronique pour le demarrage d'un moteur a induction monophase.
US5093864A (en) * 1989-02-28 1992-03-03 Kabushiki Kaisha Toshiba Silencer
US5451853A (en) * 1992-12-05 1995-09-19 Yamada Electric Mfg. Co., Ltd. Starting device for a single phase induction motor
US5574341A (en) * 1992-07-30 1996-11-12 Yang; Tai-Her Compound motor limiting control circuit for controllable shunt field winding by means
US5589753A (en) * 1994-04-11 1996-12-31 Andrew S. Kadah Rate effect motor start circuit
US5689168A (en) * 1996-10-31 1997-11-18 Therm-O-Disc, Incorporated Control circuit for two speed motors
US5892349A (en) * 1996-10-29 1999-04-06 Therm-O-Disc, Incorporated Control circuit for two speed motors
US5973473A (en) * 1996-10-31 1999-10-26 Therm-O-Disc, Incorporated Motor control circuit
WO2003007468A1 (en) * 2001-07-12 2003-01-23 Varidigm Corporation Variable speed controller for air moving applications using an acinduction motor
US20030107343A1 (en) * 2001-11-27 2003-06-12 In-Seok Kim Voltage-controlled starting relay for induction motor
US20040184791A1 (en) * 2003-03-21 2004-09-23 Sunbeam Products, Inc. Closed loop feedback method for electric motor
US20040263109A1 (en) * 2000-07-25 2004-12-30 Empresa Brasileira De Compressores S.A. - Embraco Electronic circuit for starting a single phase induction motor
US20050007062A1 (en) * 2003-07-09 2005-01-13 Mehlhorn William L. Switch assembly, electric machine having the switch assembly, and method of controlling the same
US20050231151A1 (en) * 2003-07-09 2005-10-20 Iida Keizo Synchronous induction motor and electric hermetic compressor using the same
US20060017417A1 (en) * 2004-07-23 2006-01-26 Botega Mario L Jr Electronic startup device for hermetic compressors
EP1841054A2 (en) * 2006-03-31 2007-10-03 Thomson Licensing S.A. Method of servo-controlling the speed of an electric motor on start-up, and apparatus implementing the system.
US20070253133A1 (en) * 2006-04-28 2007-11-01 Danfoss Compressors Gmbh Motor starter circuit
US20080018293A1 (en) * 2006-07-19 2008-01-24 Danfoss Compressors Gmbh Motor start circuit
WO2008038125A3 (en) * 2006-09-29 2008-07-31 Itw Ind Components Srl Electronic starter device for an electric motor, in particular for a compressor of a refrigerating circuit of an electric household appliance
US20080225447A1 (en) * 2006-11-07 2008-09-18 Danfoss Compressors Gmbh Motor start circuit
WO2009112219A2 (en) * 2008-03-12 2009-09-17 Sumoto S.R.L. Method and device for starting single-phase asynchronous motors
WO2012037624A2 (en) 2010-09-20 2012-03-29 Whirlpool S.A. A start and control method for a single-phase induction motor, a start and control system for a single-phase induction motor and an electronic start and control device applied to a single-phase induction motor
US20150137730A1 (en) * 2013-11-18 2015-05-21 Kriwan Industrie-Elektronik Gmbh Asynchronous motor and method for operating an asynchronous motor
US9328727B2 (en) 2003-12-08 2016-05-03 Pentair Water Pool And Spa, Inc. Pump controller system and method
US9404500B2 (en) 2004-08-26 2016-08-02 Pentair Water Pool And Spa, Inc. Control algorithm of variable speed pumping system
US9551344B2 (en) 2004-08-26 2017-01-24 Pentair Water Pool And Spa, Inc. Anti-entrapment and anti-dead head function
US9556874B2 (en) 2009-06-09 2017-01-31 Pentair Flow Technologies, Llc Method of controlling a pump and motor
US9568005B2 (en) 2010-12-08 2017-02-14 Pentair Water Pool And Spa, Inc. Discharge vacuum relief valve for safety vacuum release system
US9726184B2 (en) 2008-10-06 2017-08-08 Pentair Water Pool And Spa, Inc. Safety vacuum release system
US9777733B2 (en) 2004-08-26 2017-10-03 Pentair Water Pool And Spa, Inc. Flow control
US9885360B2 (en) 2012-10-25 2018-02-06 Pentair Flow Technologies, Llc Battery backup sump pump systems and methods
US9932984B2 (en) 2004-08-26 2018-04-03 Pentair Water Pool And Spa, Inc. Pumping system with power optimization
US10240604B2 (en) 2004-08-26 2019-03-26 Pentair Water Pool And Spa, Inc. Pumping system with housing and user interface
US10465676B2 (en) 2011-11-01 2019-11-05 Pentair Water Pool And Spa, Inc. Flow locking system and method
US10731655B2 (en) 2004-08-26 2020-08-04 Pentair Water Pool And Spa, Inc. Priming protection
US10871001B2 (en) 2004-08-26 2020-12-22 Pentair Water Pool And Spa, Inc. Filter loading
US10947981B2 (en) 2004-08-26 2021-03-16 Pentair Water Pool And Spa, Inc. Variable speed pumping system and method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100223305B1 (ko) * 1997-03-28 1999-10-15 전주범 가스보일러의 양방향펌프제어방법
KR100223304B1 (ko) * 1997-03-28 1999-10-15 전주범 가스보일러의 양방향펌프제어방법
KR20080004838U (ko) * 2008-08-29 2008-10-22 김인석 드릴머신의 정·역 회전 제어장치
WO2010074375A1 (ko) * 2008-12-24 2010-07-01 Kim In-Seok 드릴링 머신의 정역회전 제어장치

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US4366426A (en) * 1981-09-08 1982-12-28 S.A. Armstrong Limited Starting circuit for single phase electric motors
US4399394A (en) * 1981-11-02 1983-08-16 Ballman Gray C Electronic motor start switch
US4468604A (en) * 1982-03-04 1984-08-28 Andrew Zaderej Motor starting circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4366426A (en) * 1981-09-08 1982-12-28 S.A. Armstrong Limited Starting circuit for single phase electric motors
US4399394A (en) * 1981-11-02 1983-08-16 Ballman Gray C Electronic motor start switch
US4468604A (en) * 1982-03-04 1984-08-28 Andrew Zaderej Motor starting circuit

Cited By (97)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4751449A (en) * 1986-09-24 1988-06-14 Pt Components, Inc. Start from coast protective circuit
US4751450A (en) * 1986-09-24 1988-06-14 Pt Components, Inc. Low cost, protective start from coast circuit
US4782278A (en) * 1987-07-22 1988-11-01 Pt Components, Inc. Motor starting circuit with low cost comparator hysteresis
US4786850A (en) * 1987-08-13 1988-11-22 Pt Components, Inc. Motor starting circuit with time delay cut-out and restart
US4804901A (en) * 1987-11-13 1989-02-14 Kilo-Watt-Ch-Dog, Inc. Motor starting circuit
EP0356310A1 (en) * 1988-08-16 1990-02-28 In Suk Kim Electronic motor starter
US4967131A (en) * 1988-08-16 1990-10-30 Kim In S Electronic motor starter
AU626215B2 (en) * 1988-08-16 1992-07-23 In Suk Kim Electronic motor starter
US5093864A (en) * 1989-02-28 1992-03-03 Kabushiki Kaisha Toshiba Silencer
DE4023749C2 (de) * 1989-11-28 2001-04-26 Brasil Compressores Sa Elektronische Schaltung zum Starten eines Einphasen-Induktionsmotors
FR2655216A1 (fr) * 1989-11-28 1991-05-31 Brasil Compressores Sa Circuit electronique pour le demarrage d'un moteur a induction monophase.
US5574341A (en) * 1992-07-30 1996-11-12 Yang; Tai-Her Compound motor limiting control circuit for controllable shunt field winding by means
US5451853A (en) * 1992-12-05 1995-09-19 Yamada Electric Mfg. Co., Ltd. Starting device for a single phase induction motor
US5589753A (en) * 1994-04-11 1996-12-31 Andrew S. Kadah Rate effect motor start circuit
US5892349A (en) * 1996-10-29 1999-04-06 Therm-O-Disc, Incorporated Control circuit for two speed motors
US5689168A (en) * 1996-10-31 1997-11-18 Therm-O-Disc, Incorporated Control circuit for two speed motors
US5973473A (en) * 1996-10-31 1999-10-26 Therm-O-Disc, Incorporated Motor control circuit
US7218075B2 (en) * 2000-07-25 2007-05-15 Empresa Brasileira De Compressores S.A. - Embraco Electronic circuit for starting a single phase induction motor
US20040263109A1 (en) * 2000-07-25 2004-12-30 Empresa Brasileira De Compressores S.A. - Embraco Electronic circuit for starting a single phase induction motor
WO2003007468A1 (en) * 2001-07-12 2003-01-23 Varidigm Corporation Variable speed controller for air moving applications using an acinduction motor
US6864659B2 (en) 2001-07-12 2005-03-08 Varidigm Corporation Variable speed controller for air moving applications using an AC induction motor
US6819075B2 (en) * 2001-11-27 2004-11-16 In-Seok Kim Voltage-controlled starting relay for induction motor
US20030107343A1 (en) * 2001-11-27 2003-06-12 In-Seok Kim Voltage-controlled starting relay for induction motor
US20040184791A1 (en) * 2003-03-21 2004-09-23 Sunbeam Products, Inc. Closed loop feedback method for electric motor
US6989649B2 (en) 2003-07-09 2006-01-24 A. O. Smith Corporation Switch assembly, electric machine having the switch assembly, and method of controlling the same
US20070113647A1 (en) * 2003-07-09 2007-05-24 A.O. Smith Corporation Switch assembly, electric machine having the switch assembly, and method of controlling the same
US20050231151A1 (en) * 2003-07-09 2005-10-20 Iida Keizo Synchronous induction motor and electric hermetic compressor using the same
US20050007062A1 (en) * 2003-07-09 2005-01-13 Mehlhorn William L. Switch assembly, electric machine having the switch assembly, and method of controlling the same
US7427844B2 (en) 2003-07-09 2008-09-23 A. O. Smith Corporation Switch assembly, electric machine having the switch assembly, and method of controlling the same
US7042192B2 (en) 2003-07-09 2006-05-09 A.O. Smith Corporation Switch assembly, electric machine having the switch assembly, and method of controlling the same
US7071650B2 (en) * 2003-07-09 2006-07-04 Matsushita Electric Industrial Co., Ltd. Synchronous induction motor and electric hermetic compressor using the same
US7183741B2 (en) 2003-07-09 2007-02-27 A. O. Smith Corporation Switch assembly, electric machine having the switch assembly, and method of controlling the same
US20050156557A1 (en) * 2003-07-09 2005-07-21 A. O. Smith Corporation Switch assembly, electric machine having the switch assembly, and method of controlling the same
US20050158177A1 (en) * 2003-07-09 2005-07-21 A.O. Smith Corporation Switch assembly, electric machine having the switch assembly, and method of controlling the same
US10289129B2 (en) 2003-12-08 2019-05-14 Pentair Water Pool And Spa, Inc. Pump controller system and method
US10409299B2 (en) 2003-12-08 2019-09-10 Pentair Water Pool And Spa, Inc. Pump controller system and method
US10416690B2 (en) 2003-12-08 2019-09-17 Pentair Water Pool And Spa, Inc. Pump controller system and method
US9399992B2 (en) 2003-12-08 2016-07-26 Pentair Water Pool And Spa, Inc. Pump controller system and method
US9371829B2 (en) 2003-12-08 2016-06-21 Pentair Water Pool And Spa, Inc. Pump controller system and method
US9328727B2 (en) 2003-12-08 2016-05-03 Pentair Water Pool And Spa, Inc. Pump controller system and method
US10642287B2 (en) 2003-12-08 2020-05-05 Pentair Water Pool And Spa, Inc. Pump controller system and method
US10241524B2 (en) 2003-12-08 2019-03-26 Pentair Water Pool And Spa, Inc. Pump controller system and method
US20060017417A1 (en) * 2004-07-23 2006-01-26 Botega Mario L Jr Electronic startup device for hermetic compressors
US10871001B2 (en) 2004-08-26 2020-12-22 Pentair Water Pool And Spa, Inc. Filter loading
US9404500B2 (en) 2004-08-26 2016-08-02 Pentair Water Pool And Spa, Inc. Control algorithm of variable speed pumping system
US9932984B2 (en) 2004-08-26 2018-04-03 Pentair Water Pool And Spa, Inc. Pumping system with power optimization
US10240604B2 (en) 2004-08-26 2019-03-26 Pentair Water Pool And Spa, Inc. Pumping system with housing and user interface
US9777733B2 (en) 2004-08-26 2017-10-03 Pentair Water Pool And Spa, Inc. Flow control
US11391281B2 (en) 2004-08-26 2022-07-19 Pentair Water Pool And Spa, Inc. Priming protection
US11073155B2 (en) 2004-08-26 2021-07-27 Pentair Water Pool And Spa, Inc. Pumping system with power optimization
US10947981B2 (en) 2004-08-26 2021-03-16 Pentair Water Pool And Spa, Inc. Variable speed pumping system and method
US10240606B2 (en) 2004-08-26 2019-03-26 Pentair Water Pool And Spa, Inc. Pumping system with two way communication
US9605680B2 (en) 2004-08-26 2017-03-28 Pentair Water Pool And Spa, Inc. Control algorithm of variable speed pumping system
US10871163B2 (en) 2004-08-26 2020-12-22 Pentair Water Pool And Spa, Inc. Pumping system and method having an independent controller
US9551344B2 (en) 2004-08-26 2017-01-24 Pentair Water Pool And Spa, Inc. Anti-entrapment and anti-dead head function
US10731655B2 (en) 2004-08-26 2020-08-04 Pentair Water Pool And Spa, Inc. Priming protection
US10415569B2 (en) 2004-08-26 2019-09-17 Pentair Water Pool And Spa, Inc. Flow control
US10480516B2 (en) 2004-08-26 2019-11-19 Pentair Water Pool And Spa, Inc. Anti-entrapment and anti-deadhead function
US10527042B2 (en) 2004-08-26 2020-01-07 Pentair Water Pool And Spa, Inc. Speed control
US10502203B2 (en) 2004-08-26 2019-12-10 Pentair Water Pool And Spa, Inc. Speed control
EP1841054A3 (en) * 2006-03-31 2014-12-24 Thomson Licensing SA Method of servo-controlling the speed of an electric motor on start-up, and apparatus implementing the system.
CN101064489B (zh) * 2006-03-31 2012-02-08 汤姆森许可贸易公司 电机速度的伺服控制方法
EP1841054A2 (en) * 2006-03-31 2007-10-03 Thomson Licensing S.A. Method of servo-controlling the speed of an electric motor on start-up, and apparatus implementing the system.
FR2899403A1 (fr) * 2006-03-31 2007-10-05 Thomson Licensing Sa Methode d'asservissement de la vitesse d'un moteur electrique au demarrage, et appareil mettant en oeuvre le systeme.
US20080007194A1 (en) * 2006-03-31 2008-01-10 Philippe Mace Method of servo controlling the speed of an electric motor on start-up, and apparatus implementing the system
US7567043B2 (en) 2006-03-31 2009-07-28 Thomson Licensing Method of servo controlling the speed of an electric motor on start-up, and apparatus implementing the system
US20070253133A1 (en) * 2006-04-28 2007-11-01 Danfoss Compressors Gmbh Motor starter circuit
US7630180B2 (en) 2006-04-28 2009-12-08 Danfoss Compressors Gmbh Motor starter circuit
US20080018293A1 (en) * 2006-07-19 2008-01-24 Danfoss Compressors Gmbh Motor start circuit
US7777438B2 (en) 2006-07-19 2010-08-17 Danfoss Compressors Gmbh Motor start circuit
WO2008038125A3 (en) * 2006-09-29 2008-07-31 Itw Ind Components Srl Electronic starter device for an electric motor, in particular for a compressor of a refrigerating circuit of an electric household appliance
US8072179B2 (en) 2006-09-29 2011-12-06 Itw Industrial Components S.R.L. Con Unico Socio Electronic starter device for an electric motor, in particular for a compressor of a refrigerating circuit of an electric household appliance
US20100013426A1 (en) * 2006-09-29 2010-01-21 Itw Industrial Components S.R.L. Con Unico Socio Electronic starter device for an electric motor, in particular for a compressor of a refrigerating circuit of an electric household appliance
US20080225447A1 (en) * 2006-11-07 2008-09-18 Danfoss Compressors Gmbh Motor start circuit
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WO2009112219A3 (en) * 2008-03-12 2010-11-18 Sumoto S.R.L. Method and device for starting single-phase asynchronous motors
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JPH0348748B2 (ja) 1991-07-25
KR840003933A (ko) 1984-10-04
JPS59159681A (ja) 1984-09-10
KR840002367B1 (ko) 1984-12-21

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